ttyplot.c: Fix crash with -O1 on Ctrl+C

hartwork · hartwork · commit e94848425f77 · 2023-12-26T00:31:25.000+01:00
To reproduce:

1. Run "ttyplot" (as is)
2. Hit Ctrl+C
3. See message "*** bit out of range 0 - FD_SETSIZE on fd_set ***: terminate"
   and "Aborted"
diff --git a/ttyplot.c b/ttyplot.c
@@ -481,7 +481,7 @@ static int wait_for_events(int signal_read_fd, int tty, bool stdin_is_open, stru
             ret |= EVENT_SIGNAL_READABLE;
         }
 
-        if (FD_ISSET(tty, &read_fds)) {
+        if ((tty != -1) && FD_ISSET(tty, &read_fds)) {
             ret |= EVENT_TTY_READABLE;
         }
 

Original file line number	Diff line number	Diff line change
`@@ -481,7 +481,7 @@ static int wait_for_events(int signal_read_fd, int tty, bool stdin_is_open, stru`
`481`	`481`	`ret \|= EVENT_SIGNAL_READABLE;`
`482`	`482`	`}`
`483`	`483`
`484`		`- if (FD_ISSET(tty, &read_fds)) {`
	`484`	`+ if ((tty != -1) && FD_ISSET(tty, &read_fds)) {`
`485`	`485`	`ret \|= EVENT_TTY_READABLE;`
`486`	`486`	`}`
`487`	`487`